title: Structure, crystal growth, optical and mechanical studies of poly bis (thiourea) silver (I) nitrate single crystal: a new semi organic NLO material.
abstract: A new semi organic non linear optical polymeric crystal, bis (thiourea) silver (I) nitrate (TuAgN) with dimension 8×7×1.5 mm(3) has been successfully grown from aqueous solution by slow evaporation solution technique. Single crystal X-ray diffraction study reveals that the crystal belongs to orthorhombic system with non centrosymmetric space group C2221. The crystalline perfection of the crystal was analyzed by high resolution X-ray diffraction (HRXRD) rocking curve measurements. Functional groups present in the crystal were analyzed qualitatively by infrared and Confocal Raman spectral analysis. Effects due to coordination of thiourea with metal ions were also discussed. Optical absorption study on TuAgN crystal shows the minimum absorption in the entire UV-Vis region and the lower cut off wavelength of TuAgN is found to be 318 nm. Thermal analysis shows that the material is thermally stable up to 180°C. The mechanical strength and its parameters of the grown crystal were estimated by Vicker's microhardness test. The second harmonic generation (SHG) efficiency of the crystal was measured by Kurtz's powder technique infers that the crystal has nonlinear optical (NLO) efficiency 0.85 times that of KDP.
authors.affiliation: Department of Physics, Presidency College, Chennai 600 005, India.
authors.forename: N
authors.initials: N
authors.lastname: Sivakumar
authors.forename: N
authors.initials: N
authors.lastname: Kanagathara
authors.forename: B
authors.initials: B
authors.lastname: Varghese
authors.forename: G
authors.initials: G
authors.lastname: Bhagavannarayana
authors.forename: S
authors.initials: S
authors.lastname: Gunasekaran
authors.forename: G
authors.initials: G
authors.lastname: Anbalagan
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D003460:Crystallization; D006245:Hardness Tests; D008958:Models, Molecular; D009566:Nitrates / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013818:Thermogravimetry; D013890:Thiourea / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D056831:Coordination Complexes; D009566:Nitrates; D012834:Silver; D013890:Thiourea
keywords: Crystal growth; Crystal structure; Microhardness; Nonlinear optical material; Optical property; Thermal analysis